a black mineral that is an ore of niobium and tantalum 同义词：niobite,
Columbite, also called niobite, niobite-tantalite and columbate [(Fe, Mn)Nb2O6], is a black mineral group that is an ore of niobium. It has a submetallic luster and a high density and is a niobate of iron and manganese.
例句与用法
1.
Study of intensive decomposition technique of titanium - columbite - tantalite ore 钛钽铌矿强化分解工艺的研究
2.
Preparation and characterization of pmn - pt relaxation ferroelectric powder by columbite precursor method 弛豫铁电体及其表征
3.
We are one of the biggest end user of tantalite and columbite . we need the ores at the long - term . if you have the ores to sell , please contact us instantly 我们是中国最大的使用钽铌矿公司之一,我们长期需要钽矿和铌矿.如果你有这些矿石,请直接联系我们
4.
The compositions of usual elements and rare earth elements and inclusions of corundum megacrysts related to alkali basalt in changle , shandong province , are analyzed . in the main parts of corundum megacrysts are a large number of fluid - melting inclusions , zircon , ta - columbite inclusions , and in the central crystal core are a large number of melting inclusions . the corundum megacrysts were formed in different periods and different physical chemistry conditions . the crystal core was formed in magma system , and the main parts were formed in inhomogeneously geochemical conditions in which magam and fluid phases coexisted 分析山东昌乐与碱性玄武岩有关的刚玉巨晶不同部位的常量元素、稀土元素及包裹体组成.刚玉巨晶的主体以大量流体?熔体包裹体、锆石、铌(钽)铁矿包裹体为主，而巨晶中的“晶核”部位则以大量的熔体包裹体为主，反映研究区的刚玉巨晶是在不同的阶段形成的.刚玉“晶核”以及“铜皮刚玉”形成于熔体相为主的体系中，而主体刚玉则形成于熔体?流体过渡的急剧变化的不均一的地球化学环境中
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